Fluid-operated tool.



Pateiited Sept. 12,1916.

L. w. GREVE.

FLUID OPERATED TOOL,

APPLICATION FILED .IRN- 711916 1K ll l Il 1.

WITN E551 J LUUTS W. GltlEWlE, UHF CLIEVJELMEID, OHIO, ASSIGNOR, T0 'ILI-Hi CLEVELAND PNEUMATIC- TUUL UUMHEW, UlE CLEVELAND, OHIO, A CORPORATION .OF OHIO.

i nurn-ornna'rnn root.

valve type wherein the air supply and exhaust charnhers are advantageously arranged both from an operative and constructive standpoint, and the provision of improved lochingnieans for securing the handle and hody portion from accidental unscrewing and loosening.

One embodiment of the trated in the accompanying drawings, where- Figure 1 is a longitudinal section through the hammer-employing my invention, Fig. 2 is a' se ction on the line H ll of Fig. 1., and Fig. 3 is a partial side elevation of the hammer at the point of connection be tween the handle and the cylinder casing,

.' but with the snap ring removed.

The principal parts of the apparatus are -as follows;'1 is the handle; 2 is the cylinder casing screw-threaded to the handle'at 3;

4 is the hammer piston; 55 isthe valve block or cage; 6 is the valve block button or disk clamped between the endof the cylinder casing and the end of the cage 5;

7 is a sleeve'valve through which the hammer piston neeiprocates; 8 isthe locking ring for preventing accidental unscrewing held in 'closed'position by the spring 13; 14-

is the rod for operating the trottle valve;

f and 15 isthe trigger for moving the rod 14:.

The; valve cageo isprovided with a rear.-

wardly projecting compression chamber 16 which is surrounded by the air supply reservoir or chamher 17 to which air passes from the throttle valve through the passage 18. Air reaches the interior of the valve sleeve behind the liner pistonthrough the passage 18 and exhausted from the invention is illus-' groove 22.

hpecihcation of Letters Patent. Patented Sept. 1L2, light}.

Application filed January 7, 1916. Serial No. 70,785;

front end of the cylinder casing through the passage 19, such passage leading via the groove 20to the annular exhaust chamber 21 formed between the outer face of the valve cage andthe inner surface of the handle. When the sleeve valve is moved to the right from the position shown it uncovers a groove 22, and on the rearward movement of the hammer piston 4: exhaust occurs throughsuch groove 22 and the passage 23 leading to" the annular exhaustchamber 21. 4

The sleeve valve and the port connections whereby it is operated are similar in general arrangement to those shown in my co-pending application, Serial No- 872,063, filed November 14,1914, and a briefdescription .will be sufiicient'to indicate the operation of the valve and its relation to the valve cage and the supply and exhaust chambers 17 and 21 inwhich my invention particularly resides. When the parts are in the position illustrated, air is being admitted from the chamber 17 to the cylinder casing behind the piston via the passage 18 and the piston is passing to the left. At this time air is being exhausted through the passage 19, groove 20 and annular exhaust chamber 21,

A such chamber having an outlet 24 to the atmosphere. ,Also at this time the piston covers the port 25 which leads via a passage 26 'and port 27 to the'pressure receiving surface-28 of the valve. The passage 26 is also extended-to the rear in a passage 29 which receives live air from the chamber 17 so that while the piston covers the port 25 7 pressure is being built up against the surface 28 of the sleeve valve. l/Vhen this pressure becomes sufficiently great to over-' come the pressure on the receiving surface 30 ofthe valve it is moved to the right covering the groove 31 and uncovering the This movement of the valve shuts off the supply of air to the rear of the piston through the passage 18, at the.

move to theleft'to the position shown.

when the right-hand end of the piston covers the exhaust-groove 22 and compression occurs in the chamber 16, the. increased pressure on the surface 30 causes the valve to "It may be further stated with respect to the matter of pressures upon the surfaces of the valve that during the forward movement of the piston (to left) the pressures on the surfaces 30 and 30, are the same, but 30 is the larger so that the valve stays in the position shown until the pressure on the surface 28, as above described, causes the valve to move to right, the force required being of course relatively slight, since the pressures-on the surfaces 30 and 31 nearly balance each other. Also when the piston in its-movement to the right covers the forward end of the valve, the force required bythe compressed air on the surface 30 to shift the valve to the 'left is slight since there is only. exhaust pressure on the surfaces 30', 28 and 28 and these pressures are nearly balanced.

j -The piston is cushioned in its rearward movement by the air compressed in the chamber 16. 'The port 33 in the rear end of the compression chamber is useful when themachine is operated up-side-down, and the piston happens to be in the compression .chamber, in which case the 'air from the port 33 will give the piston its initial movement. The locating of the supply reservoir 17*around. the compression chamber is advantageous, as'it gives a relatively large volume of air under pressure close to the point of application of such air tending to steady the running of the machine. This arrangement also tends to compactness, and thereis a constructive advantage in having this chamber and the exhaust chamber 21 formed between the opposing surfaces of the cage and handle where the cavities are readily accessible and easily formed. .The arrangement and size of the chamber '21 provides for a free exhaust.

An advantage is also involved in having the compression chamber.16 integral with the valve cage block 5, instead of having the rear wall of such chamber formed v by a wall of the handle, since any loosening degrees, so that relative rotative movement is prevented when the locking ring is in operative position. The inner surface of the locking ring is provided with a plurality of longitudinal slots 36, and the cylinder' casing carries the removable pin 9 whose outer end 38'is'formed with flattened sides and eccentrictwith respect tothe bodyof the pin and adapted to engage one of the slots 36. The elongated flattened end engaging the slot prevents the pin turning on its. axis. The plurality of holes 39 for the pin 9 are provided so that it may be adjusted circumferentially of the cylinder casing. As indicated in Fig. 2 these holes are spaced with respect to the slots 36 in the ratio of 3 to 4, so that leaving aside the matter of the eccentric arrangement of the end of the pin, it-is necessary to rotate the ring only one-half the distance between two of the slots 36 in order to secure a second connection between the pin and the ring. For instance, if it were necessary to rotate the ring clock-wise half the distance between two slots 36, the pin 9 would'give this adjustment if shifted to the hole to the right of the one which it now occupies. The eccentric arrangement of the end 38 also increases the finenessor range of the adjustment. The two sets of adjustment together divide the spaces between the slots 36 to ,such an extent that. the ring -8 can be made to interlock both with the handle and with the cylinder casing when the parts are screwed-tight. The snap ring 10 is open at one side asindicated in Fig. 2, and has one flanged edge in engagement with a groove in the handle and the otherwith a shoulder on the locking ring8.

. The throttle valve 12 is provided with a plurality of small. holes 40, so that when the valve is only slightly depressed, a small quantity of air flows to these openings through the ports 41, the rod 18 fitting its socket in the. valve loosely'so that the air which'passes the openings 40 can flow up into the supply passage 18 and give the machine its starting movement. A further movement of the valve permits. a full supply of air fromthe ports 41 to flow past its upper edge, this being the normal working position of the valve.

What I claim is: a

. 1.. In combination in a fluid operated tool,

a handle provided with a fluid supply chamber, a cylinder carrying a piston hammer and secured to the handle, a valve cage between the cylinder and handle and provided with a compression chamber projecting into and surrounded bysaid supply chamber, and a sleeve .valve mounted in the case forward of the said compression chamber.

2. In combination in a fluid operated tool, 'a handle I provided with a fluid supply chamber, a cylinder carrying a piston hamlid meeaae mer and secured to the handle, a valve cage between the cylinder and handle and provided with a compression chamber projecting into the said supply chamber and having its sides and rear end surrounded by said chamber, and a sleeve valve mounted in the cbage' forward of the said compression cham- 3. Incombination in a fluid operated tool,

a handle, a cylinder carrying a piston hammer and secured to the handle, a valve cage at the rear end of the cylinder, a compression chamber having its side and rear walls a part of said'cage, and a sleeve valve mounted 1n the cage forward of the compression chamber.

, l. In combination in a fluid operated tool, a handle provided with a fluid supply chamber, a cylinder carrying a piston hammer and secured to the handle, a valve'cage at the rear end of the cylinder, a compression chamber having its side and rear walls integral, with the valve cage and surrounded by said supply chamber, and a sleeve valve mounted in the cage forward of the said compression chamber.

5. In combination ina fluid operated tool, a handle, 'a cylinder carrying a piston hammer andsecured to the handle, a valve cage at the rear end of the cylinder having integral therewith at its rear end a compression chamber, and a sleeve valve mounted in the cage forward of the compression chamber.

LOUIS W. GREVE. 

